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Aggregation behaviors of light-active barbituric acid molecular components in solution 轻活性巴比妥酸分子组分在溶液中的聚集行为
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00114-X
R. Lu, Y.S. Jiang, J.Q. Duo, X.D. Chai, W.S. Yang, N. Lu, Y.W. Cao, T.J. Li
{"title":"Aggregation behaviors of light-active barbituric acid molecular components in solution","authors":"R. Lu,&nbsp;Y.S. Jiang,&nbsp;J.Q. Duo,&nbsp;X.D. Chai,&nbsp;W.S. Yang,&nbsp;N. Lu,&nbsp;Y.W. Cao,&nbsp;T.J. Li","doi":"10.1016/S0968-5677(98)00114-X","DOIUrl":"10.1016/S0968-5677(98)00114-X","url":null,"abstract":"<div><p>Self-aggregation of light active barbituric acid derivatives and their self-assembly with melamine derivatives through hydrogen-bonding, π-aromatic stacking, and other weak interactions were studied by UV–visible absorption and fluorescence spectroscopy. PB<sub>12</sub>Me has the same fluorescence behavior as PB<sub>12</sub> in chloroform though it cannot aggregate through a hydrogen-bond. AB<sub>12</sub> and AB<sub>1</sub> lead to different degrees of fluorescence splitting. When barbituric acid molecular components were self-assembled with melamine a similar splitting phenomenon was observed. It was shown that π-aromatic stacking resulted in the exclusive fluorescence changes and H-aggregates were formed in solution.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 737-740"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00114-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76404873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Alignment of liquid crystals on ultrathin organized molecular films 液晶在超薄分子膜上的排列
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00095-9
Zuhong Lu, Huihua Deng, Yu Wei
{"title":"Alignment of liquid crystals on ultrathin organized molecular films","authors":"Zuhong Lu,&nbsp;Huihua Deng,&nbsp;Yu Wei","doi":"10.1016/S0968-5677(98)00095-9","DOIUrl":"10.1016/S0968-5677(98)00095-9","url":null,"abstract":"<div><p>Liquid crystal (LC) alignment techniques based on various kinds of ultrathin organized molecular films are reviewed. The mechanisms of LC alignment on the organized films are discussed. For the homeotropic alignment of LCs the main anchoring mechanism is due to the dipole–dipole interaction between polar groups of an aligning agent and LC molecules while the homogeneous alignment is mainly attributed to the orientation of polymer chains or polymer aggregates. An experimental system for an anchoring transition induced by a conformation change of aligning molecules is introduced. Finally the AFM experimental observations on the rubbed polymer films and its mechanisms are summarized.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 649-655"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00095-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83189987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A novel method for detecting · OH radicals generated by photoexcited nanoparticles 一种检测光激发纳米粒子产生的·OH自由基的新方法
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00053-4
Qing Dai, Deyu Wang, Chunwei Yuan
{"title":"A novel method for detecting · OH radicals generated by photoexcited nanoparticles","authors":"Qing Dai,&nbsp;Deyu Wang,&nbsp;Chunwei Yuan","doi":"10.1016/S0968-5677(98)00053-4","DOIUrl":"10.1016/S0968-5677(98)00053-4","url":null,"abstract":"<div><p>The Fenton reactions occur because of the generation of H<sub>2</sub>O<sub>2</sub> in the photoexcited independent TiO<sub>2</sub> systems or TiO<sub>2</sub>/SnO<sub>2</sub> coupled systems. The ·OH radicals in these reactions were indirectly measured by colorimetric method. According to the Lambert–Beer law, we obtained the qualitative and quantitative relationships between the amount of TiO<sub>2</sub> or TiO<sub>2</sub>/SnO<sub>2</sub> coupled particles and the amount of ·OH radicals produced by these systems. It provides a convenient procedure for making a thorough study on the photocatalytic mechanism of semiconductor nanoparticles, and in particular, to select highly efficient multicomponent semiconductor systems for photocatalysis.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 469-473"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00053-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76742104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
LB Films exhibiting SHG coupled with electric properties LB薄膜表现出SHG和电学特性
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00059-5
Shan Bao-Zhen , Bai Zhi-Ping , Chen Yao , You Xiao-Zeng , Cai Zhi-Gang , Yang Pei-Qing
{"title":"LB Films exhibiting SHG coupled with electric properties","authors":"Shan Bao-Zhen ,&nbsp;Bai Zhi-Ping ,&nbsp;Chen Yao ,&nbsp;You Xiao-Zeng ,&nbsp;Cai Zhi-Gang ,&nbsp;Yang Pei-Qing","doi":"10.1016/S0968-5677(98)00059-5","DOIUrl":"10.1016/S0968-5677(98)00059-5","url":null,"abstract":"<div><p>The preparation of stable monomolecular layers and semiconducting Langmuir–Blodgett films exhibiting coupled SHG effect based on hemicyanine dye and nickel maleonitrilodithiolate is described.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 499-500"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00059-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75442794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Photochemical disinfection of Escherichia coli with a TiO2 colloid solution and a self-assembled TiO2 thin film 二氧化钛胶体溶液和自组装二氧化钛薄膜对大肠杆菌的光化学消毒
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00074-1
Ningping Huang, Zhongdang Xiao, Dan Huang, Chunwei Yuan
{"title":"Photochemical disinfection of Escherichia coli with a TiO2 colloid solution and a self-assembled TiO2 thin film","authors":"Ningping Huang,&nbsp;Zhongdang Xiao,&nbsp;Dan Huang,&nbsp;Chunwei Yuan","doi":"10.1016/S0968-5677(98)00074-1","DOIUrl":"10.1016/S0968-5677(98)00074-1","url":null,"abstract":"<div><p>Effect of long-wavelength irradiated TiO<sub>2</sub> colloid solutions on <em>E. coli</em> disinfection and the kinetics mechanism have been investigated. In addition, uniform thin films of TiO<sub>2</sub> are deposited on an ordinary glass by self-assembled techniques. The modified glass also shows the photokilling effect on bacteria in the air.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 559-564"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00074-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79618773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 42
Conformation-driven computing: a comparison of designs based on DNA, RNA, and protein 构象驱动计算:基于DNA、RNA和蛋白质的设计比较
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00126-6
Michael Conrad, Klaus-Peter Zauner
{"title":"Conformation-driven computing: a comparison of designs based on DNA, RNA, and protein","authors":"Michael Conrad,&nbsp;Klaus-Peter Zauner","doi":"10.1016/S0968-5677(98)00126-6","DOIUrl":"10.1016/S0968-5677(98)00126-6","url":null,"abstract":"<div><p>Molecular pattern recognition based on conformational interactions is the major basis of control and information processing in biological cells. Designs for pattern recognition devices that use the conformational characteristics of different major classes of biomolecules (DNA, RNA, and protein) are considered.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 787-790"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00126-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82257528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Microfabrication on polymer with a contact procedure 接触工艺在聚合物上的微细加工
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00110-2
Lingang Zhang , Junfu Liu, Zuhong Lu
{"title":"Microfabrication on polymer with a contact procedure","authors":"Lingang Zhang\u0000 ,&nbsp;Junfu Liu,&nbsp;Zuhong Lu","doi":"10.1016/S0968-5677(98)00110-2","DOIUrl":"10.1016/S0968-5677(98)00110-2","url":null,"abstract":"<div><p>In the fabrication of a microstructure, it is usually difficult to make deep etching with the conventional photolithography. Here the fabrication of thickness contrast micropatterns based on a contact procedure is demonstrated. Polymer (polydimethylsiloxane) microposts arrays have been fabricated with grids as the masters. The contact procedure, which does not need the etching procedure, extends the present limit of microfabrication. Moreover, the thickness contrast micropatterns on the polymer can be replicated to other substrates (such as silicon wafer) with the microcontact printing.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 713-715"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00110-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80046319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Characterization of CdS nanoparticles formed and aggregated in stearic acid Langmuir–Blodgett films by atomic force microscopy 硬脂酸Langmuir-Blodgett薄膜中CdS纳米颗粒形成和聚集的原子力显微镜表征
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00072-8
X.M. Yang , G.M. Wang, Z.H. Lu
{"title":"Characterization of CdS nanoparticles formed and aggregated in stearic acid Langmuir–Blodgett films by atomic force microscopy","authors":"X.M. Yang ,&nbsp;G.M. Wang,&nbsp;Z.H. Lu","doi":"10.1016/S0968-5677(98)00072-8","DOIUrl":"10.1016/S0968-5677(98)00072-8","url":null,"abstract":"<div><p>Alternate films, which are composed of stearic acid and CdS nanoparticles were synthesized by exposing Langmuir–Blodgett (LB) films of cadmium stearate (CdSt<sub>2</sub>) to H<sub>2</sub>S gas at a pressure of 1<!--> <!-->Torr. The changes of surface morphology of film with the increased reaction time were directly observed by atomic force microscopy for the first time. Before being exposed to H<sub>2</sub>S, the surface of CdSt<sub>2</sub> LB film was homogeneous from microscale down to nanoscale, and it was observed that CdSt<sub>2</sub> molecules formed a well orderly rectangular herringbone lattice structure on the molecular scale. However, after being exposed to H<sub>2</sub>S the ordered CdSt<sub>2</sub> molecules gradually changed into a disordered state, and eventually the LB film surface became rough with the apparent feature of bulk structures on the nanoscale. This change in the morphology can be attributed to the aggregation of buried CdS nanoparticles within LB films, which has been confirmed by a structured UV–visible absorption spectrum where the absorption edge is red-shifted about 0.7<!--> <!-->eV with respect to bulk CdS. Finally, the aggregation mechanism of CdS in the LB film was analyzed.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 549-552"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00072-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87666510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
An interferometric spectrum analyzer with high dynamic range 具有高动态范围的干涉光谱分析仪
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00067-4
He Dawei, Li Yefan, Xu Chengjie
{"title":"An interferometric spectrum analyzer with high dynamic range","authors":"He Dawei,&nbsp;Li Yefan,&nbsp;Xu Chengjie","doi":"10.1016/S0968-5677(98)00067-4","DOIUrl":"10.1016/S0968-5677(98)00067-4","url":null,"abstract":"<div><p>The dynamic range improvement and realization of the acousto-optic spectrum analyzer are reported. When two RF signals of equal strengths and frequencies <em>f</em><sub>1</sub> and <em>f</em><sub>2</sub> are applied simultaneously to the signal Bragg cell, the analyzer demonstrates a dynamic range of 50<!--> <!-->dB and frequency resolution 10<!--> <!-->kHz.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 527-529"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00067-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85383578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoexcited TiO2 nanoparticles through •OH-radicals induced malignant cells to necrosis 光激发TiO2纳米粒子通过•oh自由基诱导恶性细胞坏死
Supramolecular Science Pub Date : 1998-10-01 DOI: 10.1016/S0968-5677(98)00048-0
Minhua Xu, Ningping Huang, Zhongdang Xiao, Zuhong Lu
{"title":"Photoexcited TiO2 nanoparticles through •OH-radicals induced malignant cells to necrosis","authors":"Minhua Xu,&nbsp;Ningping Huang,&nbsp;Zhongdang Xiao,&nbsp;Zuhong Lu","doi":"10.1016/S0968-5677(98)00048-0","DOIUrl":"10.1016/S0968-5677(98)00048-0","url":null,"abstract":"<div><p>Photoexcited TiO<sub>2</sub> nanoparticles have been used to cause oxidative stress in SPC-A1 lung adenocarcinoma cells in this study. It is commonly considered that hydroxyl free radicals can oxidatively stress cells to apoptosis, but through this experiment, we found that oxidative stress produced by photoexcited TiO<sub>2</sub> nanoparticles in the malignant cells led to cell necrosis, not, as it is thought, apoptosis. This was confirmed by TEM observation and DNA electrophoresis analysis. The possible mechanism of oxidative-stress-induced necrosis by photoexcited TiO<sub>2</sub> nanoparticles was discussed. The research revealed a novel possible way to kill tumor cells in the future.</p></div>","PeriodicalId":22050,"journal":{"name":"Supramolecular Science","volume":"5 5","pages":"Pages 449-451"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0968-5677(98)00048-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84208888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 32
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